Regarding pipeline calculation and material selection
Thread Content
I would like to ask about pipeline calculation and material selection: the basis for calculations, the methods used, the specific formulas, and how to select materials based on the calculation results as well as the properties of the fluid and operating conditions
The question is vague – which calculation for the pipeline? Flow rate? Diameter? Wall thickness? Stress? Hydraulics? Wait
In accordance with GB150-1998 \"Steel Pressure Vessels\", the allowable stress for steel used in pressure pipelines shall be selected as specified in the following table: For carbon steel and low-alloy steel, the allowable stress is the minimum of the values listed below, in MPa: δtn = 1.0, δtS = 1.6, δtD = 1.5, δb = 3.0, δs = 1.6. For high-alloy steel, δtD = 1.5; δts (δt0.2)1) = 1.5; δtn = 1.0; δs(δ0.2) = 1.5; δb = 3.0. 1) For austenitic high-alloy steel pressure components, when the design temperature is below the creep temperature range and a slight amount of permanent deformation is acceptable, the allowable stress may be increased to 0.9δtS (δt0.2), but not exceeding δS (δ0.2)/1.5. This requirement does not apply to flanges or other applications where leakage or failure occurs due to even minor permanent deformation.
(1) For straight pipes under internal pressure, the wall thickness is determined in accordance with SH3059-94 \"General Rules for the Selection of Materials for Pipes in Petrochemical Enterprises\": 1) When S00.385, the wall thickness of the straight pipe shall be determined by taking into comprehensive consideration factors such as fracture theory, fatigue, thermal stress, and material properties. (2) The wall thickness of straight pipes under external pressure shall be determined in accordance with the method specified in GB150-1998 \"Steel Pressure Vessels\".
Material selection and calculations can be carried out in accordance with the \"Code for Pressure Piping – Industrial Piping\"
There are too many calculations to do; it’s difficult for ordinary people to handle them all, especially stress calculations